Medical Oncologist
CION Cancer Clinics
Colon cancer screening: who needs it, when, and how it is done | CION Cancer Clinics
Screening looks for polyps or an early cancer in people who feel well. For most adults it starts in the mid-forties, with either a yearly stool test or a colonoscopy about every ten years. No screening test diagnoses cancer; a positive result simply means a colonoscopy comes next. This page explains who should be screened, which test to choose, and what happens from the first conversation to the result. At CION Cancer Clinics, our specialists help you judge which bowel symptoms need tests and plan screening that fits your risk.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
The short answer
Who needs colon cancer screening, and from what age?
Screening means looking for polyps or an early cancer in someone who feels completely well. For most adults it starts in the mid-forties and carries on until the mid-seventies. You can choose a stool test done at home once a year, or a colonoscopy repeated about every ten years if the first one is normal. Both are accepted. The one you will actually do is the right one.
Who counts as average risk
You are average risk if nobody in your close family has had colon cancer or a large polyp, you have never had polyps yourself, and you do not have long-standing ulcerative colitis or Crohn's disease. That describes most people reading this. Average risk does not mean no risk. It means the standard timetable applies to you.
Who needs to start earlier
If a parent, brother, sister or child had colon cancer, screening usually starts younger and is done by colonoscopy rather than a stool test. The same applies to anyone with a known inherited syndrome such as Lynch syndrome, and to people with inflammatory bowel disease of the colon. Our page on average-risk and high-risk pathways sets out which group you fall into.
Screening is for people without symptoms. If you have bleeding, a change in bowel habit or unexplained weight loss, you need a doctor's appointment, not a screening kit.The tests on offer
Which screening test should you choose?
There is no single correct answer. Each test trades convenience against thoroughness, and all of them lead to a colonoscopy if something is found.
FIT stool test
A small sample of stool, collected at home and sent to a laboratory, is checked for hidden blood. It is cheap, needs no preparation and no time off work. It is repeated every year because it can miss polyps that are not bleeding on the day.
Suits people who
- Are average risk and well
- Want to avoid bowel preparation
- Live far from a city hospital
Colonoscopy
A thin camera examines the whole colon under sedation, and any polyp seen is removed in the same sitting. It is the most thorough option and the only one that both finds and deals with polyps. Read what a screening colonoscopy involves before you decide.
Suits people who
- Have a family history or previous polyps
- Had a positive stool test
- Prefer one test every several years
CT colonography and sigmoidoscopy
A CT colonography builds a picture of the colon from a scan; a sigmoidoscopy looks at the lower part only. Both are used when a full colonoscopy is not possible or not wanted. Neither removes a polyp, so a finding still means a colonoscopy afterwards.
Stool DNA and blood tests
Newer tests look for altered DNA in stool or in blood. They are less widely available in India and cost more than FIT. A positive result is handled exactly like a positive FIT: it points to a colonoscopy, it does not diagnose anything.
No screening test diagnoses cancer. Only a biopsy taken at colonoscopy does that.Not sure whether this applies to you?
Ask an oncologistStart to finish
What actually happens when you get screened?
A short conversation first
A doctor asks your age, your family history and whether you have any symptoms. That decides whether a stool test is enough or whether you should go straight to colonoscopy.
The home kit, if you choose FIT
You collect a tiny sample with the stick provided, close the tube and drop it at the laboratory or collection point. Our page on doing a FIT test at home walks through it step by step.
The result
A negative FIT means no hidden blood was found this time, and you repeat it next year. A positive FIT means blood was found and the next step is a colonoscopy to see where it came from. Most positive results turn out to be piles, a polyp or nothing at all.
Colonoscopy, if needed
CION arranges the colonoscopy at an accredited partner hospital. You take a bowel-cleansing preparation the evening before, the test itself is done under sedation, and most people go home the same day.
What comes back
A normal colonoscopy puts you back on the routine timetable. If polyps were removed, their type and number decide how soon you are checked again. If a biopsy shows cancer, you are seen quickly by a CION oncologist to plan the next steps.
On the form
The words you will meet, in plain language
- Screening
- Testing someone who has no symptoms, to find a problem early. It is different from a test done to explain a symptom.
- FIT
- Faecal immunochemical test. A laboratory test for hidden blood in stool. It replaced the older FOBT test, which needed diet changes and was less accurate.
- Polyp
- A small growth on the lining of the colon. Most are harmless, but some types can slowly turn into cancer over many years if left alone.
- Adenoma
- The type of polyp that can become cancer. Finding and removing adenomas is the main reason screening lowers the chance of dying from colon cancer.
- Surveillance
- Repeat colonoscopies on a set schedule after polyps or cancer have been found. Surveillance is for people already known to be at higher risk; screening is for everyone else.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Did you know
Most colon cancers grow from a polyp over many years, not months. That slow start is the whole reason screening works: there is a long window in which a polyp can be found and removed before it ever becomes cancer.
Being straight with you
What this page cannot tell you
It cannot tell you which test is right for your own body and family. That needs a doctor who has heard your history. In Hyderabad, where organised screening programmes do not exist the way they do in the UK or the US, that conversation usually has to be started by you, or by the son or daughter who found this page.
It cannot reassure you if you have symptoms
Screening tests are built for people who feel well. If you have seen blood, noticed a lasting change in your bowel habit, or been told you have anaemia, a low haemoglobin, a negative stool test does not rule anything out. You need a proper assessment and, usually, a colonoscopy whatever the stool test says.
Who this does not apply to
If you have already been treated for colon cancer, or have had polyps removed, you are on a surveillance schedule set by your own doctor, and the general timetable here does not apply to you. People in their late seventies and beyond, or with serious other illnesses, are often better served by stopping screening, as our page on when to stop screening explains.
If you are not sure which group you belong to, call the helpline and describe your history. Someone will tell you honestly whether a stool test or a colonoscopy is the sensible first step.Questions we are asked
Common questions about colon cancer screening
I feel fine. Why would I get tested?
Because the polyps that turn into cancer cause no symptoms at all, and neither does an early cancer. By the time bleeding or pain appears, the growth is usually larger. Feeling well is the whole point of screening, not a reason to skip it.
Does a stool test diagnose cancer?
No. A FIT only shows whether hidden blood was present in that sample. A positive result means a colonoscopy is needed to find the cause, which is often piles or a polyp. A negative result means no blood was found that day, nothing more.
Is colonoscopy painful?
It is done under sedation, so most people remember little of it and describe bloating afterwards rather than pain. The part people dislike is the bowel preparation the evening before, which means a few hours close to a toilet. It is manageable and it is over quickly.
My father had colon cancer. Is a stool test enough for me?
Usually not. A parent, sibling or child with colon cancer puts you in a higher-risk group, and doctors generally advise colonoscopy, starting younger than the standard age. Read our page on screening with a family history and ask a doctor to confirm your timing.
Is screening covered by Aarogyasri or Ayushman Bharat?
Government schemes mainly cover treatment of a diagnosed illness, not routine checks in well people. A colonoscopy done to investigate a symptom or a positive test may be treated differently from one done purely for screening. Ask the hospital's scheme desk before the appointment and get the answer in writing.
Do women need screening as much as men?
Yes. Colon cancer affects women and men, and the screening timetable is the same for both. Women are sometimes screened less because bowel symptoms get blamed on periods, childbirth or piles. A well woman in her mid-forties needs the same conversation as her husband.
Do health check packages include bowel screening?
Often not. Many executive health checks in Hyderabad include an ultrasound and blood tests but no stool test for hidden blood. A CEA blood test is sometimes offered instead, and it is not a screening test. Ask specifically whether a FIT is included.
Where do I start?
Write down your age, any symptoms, and whether any close relative had colon cancer or polyps. Take that to a doctor or call the CION helpline. You will be told whether a home FIT is enough or whether a colonoscopy should be arranged, and where.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- American Cancer Society — Colorectal Cancer Screening Tests
- US Preventive Services Task Force — Recommendation: Colorectal Cancer: Screening
- National Cancer Institute — Colorectal Cancer Screening
- NHS — Bowel cancer screening
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Why screening works for colon cancerThe polyp-to-cancer window that makes screening worth doingAt what age should screening start?The starting age, and who should begin earlierFIT (faecal immunochemical test) explainedThe home stool test most people will choose firstScreening colonoscopy: what it involvesPreparation, sedation and the day itself
Talk to us
Not sure whether a stool test or a colonoscopy is right for you?
Tell us your age, your family history and any symptoms, and a CION oncologist will say honestly which test makes sense and arrange it with a partner hospital if needed. One helpline serves every CION centre.